refactor(deployment): Remove WireGuard VPN dependency and restore public service access

Remove WireGuard integration from production deployment to simplify infrastructure:
- Remove docker-compose-direct-access.yml (VPN-bound services)
- Remove VPN-only middlewares from Grafana, Prometheus, Portainer
- Remove WireGuard middleware definitions from Traefik
- Remove WireGuard IPs (10.8.0.0/24) from Traefik forwarded headers

All monitoring services now publicly accessible via subdomains:
- grafana.michaelschiemer.de (with Grafana native auth)
- prometheus.michaelschiemer.de (with Basic Auth)
- portainer.michaelschiemer.de (with Portainer native auth)

All services use Let's Encrypt SSL certificates via Traefik.

tests/debug/generate-test-qrcodes.php

@@ -0,0 +1,149 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+use App\Framework\QrCode\QrCodeGenerator;
+use App\Framework\QrCode\QrCodeRenderer;
+use App\Framework\QrCode\ValueObjects\ErrorCorrectionLevel;
+use App\Framework\QrCode\ValueObjects\QrCodeConfig;
+use App\Framework\QrCode\ValueObjects\QrCodeVersion;
+use App\Framework\QrCode\ValueObjects\EncodingMode;
+
+echo "=== Generating Test QR Codes ===\n\n";
+
+// Create output directory
+$outputDir = __DIR__ . '/test-qrcodes';
+if (!is_dir($outputDir)) {
+    mkdir($outputDir, 0755, true);
+    echo "Created output directory: {$outputDir}\n\n";
+} else {
+    echo "Output directory: {$outputDir}\n\n";
+}
+
+// Test cases with different data types and configurations
+$testCases = [
+    [
+        'data' => 'HELLO WORLD',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'hello-world-v1-m.svg',
+        'description' => 'Standard text, Version 1, Level M'
+    ],
+    [
+        'data' => 'A',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'single-char-v1-m.svg',
+        'description' => 'Single character, Version 1, Level M'
+    ],
+    [
+        'data' => 'HELLO',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'hello-v1-m.svg',
+        'description' => 'Short text, Version 1, Level M'
+    ],
+    [
+        'data' => 'https://example.com',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'url-v1-m.svg',
+        'description' => 'URL, Version 1, Level M'
+    ],
+    [
+        'data' => 'Test QR Code',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'test-text-v1-m.svg',
+        'description' => 'Text, Version 1, Level M'
+    ],
+    [
+        'data' => '123456789012345678901234567890',
+        'version' => 2,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'long-text-v2-m.svg',
+        'description' => 'Long text, Version 2, Level M'
+    ],
+    [
+        'data' => 'QR Code Test',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'qr-test-v1-m.svg',
+        'description' => 'Short test text, Version 1, Level M'
+    ],
+    [
+        'data' => '12345',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'numbers-v1-m.svg',
+        'description' => 'Numbers, Version 1, Level M'
+    ],
+    [
+        'data' => 'Hello!',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'hello-exclamation-v1-m.svg',
+        'description' => 'Text with special char, Version 1, Level M'
+    ],
+    [
+        'data' => 'test@example.com',
+        'version' => 1,
+        'level' => ErrorCorrectionLevel::M,
+        'mode' => EncodingMode::BYTE,
+        'filename' => 'email-v1-m.svg',
+        'description' => 'Email address, Version 1, Level M'
+    ],
+];
+
+$renderer = new QrCodeRenderer();
+$successCount = 0;
+$errorCount = 0;
+
+foreach ($testCases as $testCase) {
+    echo "Generating: {$testCase['description']}\n";
+    echo "  Data: '{$testCase['data']}'\n";
+    echo "  Version: {$testCase['version']}, Level: {$testCase['level']->value}\n";
+    
+    try {
+        $config = new QrCodeConfig(
+            version: QrCodeVersion::fromNumber($testCase['version']),
+            errorCorrectionLevel: $testCase['level'],
+            encodingMode: $testCase['mode']
+        );
+        
+        $matrix = QrCodeGenerator::generate($testCase['data'], $config);
+        $svg = $renderer->renderSvg($matrix);
+        
+        $filepath = $outputDir . '/' . $testCase['filename'];
+        file_put_contents($filepath, $svg);
+        
+        $fileSize = filesize($filepath);
+        echo "  ✅ Saved: {$testCase['filename']} ({$fileSize} bytes)\n";
+        $successCount++;
+    } catch (\Exception $e) {
+        echo "  ❌ Error: " . $e->getMessage() . "\n";
+        $errorCount++;
+    }
+    
+    echo "\n";
+}
+
+echo "=== Summary ===\n";
+echo "Successfully generated: {$successCount} QR codes\n";
+if ($errorCount > 0) {
+    echo "Errors: {$errorCount}\n";
+}
+echo "Output directory: {$outputDir}\n";
+echo "\nAll QR codes saved as SVG files. You can open them in a browser or scan them with a mobile phone.\n";
+